Waste-Based One-Part Alkali Activated Materials.
Margarida GonçalvesInês Silveirinha VilarinhoMarinélia Neto CapelaAna CaetanoRui Miguel NovaisJoão António LabrinchaMaria Paula SeabraPublished in: Materials (Basel, Switzerland) (2021)
Ordinary Portland Cement is the most widely used binder in the construction sector; however, a very high carbon footprint is associated with its production process. Consequently, more sustainable alternative construction materials are being investigated, namely, one-part alkali activated materials (AAMs). In this work, waste-based one-part AAMs binders were developed using only a blast furnace slag, as the solid precursor, and sodium metasilicate, as the solid activator. For the first time, mortars in which the commercial sand was replaced by two exhausted sands from biomass boilers (CA and CT) were developed. Firstly, the characterization of the slag and sands (aggregates) was performed. After, the AAMs fresh and hardened state properties were evaluated, being the characterization complemented by FTIR and microstructural analysis. The binder and the mortars prepared with commercial sand presented high compressive strength values after 28 days of curing-56 MPa and 79 MPa, respectively. The mortars developed with exhausted sands exhibit outstanding compressive strength values, 86 and 70 MPa for CT and CA, respectively, and the other material's properties were not affected. Consequently, this work proved that high compressive strength waste-based one-part AAMs mortars can be produced and that it is feasible to use another waste as aggregate in the mortar's formulations: the exhausted sands from biomass boilers.
Keyphrases
- heavy metals
- sewage sludge
- municipal solid waste
- computed tomography
- drinking water
- life cycle
- image quality
- anaerobic digestion
- contrast enhanced
- dual energy
- wastewater treatment
- magnetic resonance imaging
- positron emission tomography
- nuclear factor
- white matter
- multiple sclerosis
- atomic force microscopy
- mass spectrometry
- inflammatory response
- toll like receptor
- pet ct